Concrete and like mixer



May 11 1926; 1,583,863

J. TEMPERLEY CONCRETE AND LIKE MIXER Filed June 6. 1925 Patented May 11, 1926.

UNITED STATES PATENT orricei ,1

JosErrr TEMPERLEY, or nova, ENGLAND.

'ooivcn n'rn AND LIKE MIXE Application filed June 6, 1925. Serial No; 35,466.

This invention relates to mixers for mix- I an improved arrangement of the vanes in a mixer of the type set forth whereby an improved mixing of the materialis effected.

According'to the invention vanes are pro-v vided which risefromor commence at the bottom of the .drum fand are extended upwardly in a helicali or' other suitable path around the wall of the drum, whereby the material at the bottom ofthe drum is adapted to be lifted by the vane, carried up to a substantial height and then thrown again to the bottom of the drum. y

The number of the vanes may vary according to the size of the drum. Thus two vanes may be provided rising from the bottom at 180 apart. Three or more equally spaced vanes may, however, be'arranged. v

The accompanying drawings illustrate the application ofthe invention to two forms of mixers,

Figures 1 and 2 being a sectional elevation and plan respectively showing diagrammatically one form of drum with the 1mproved arrangement of vanes,

- Figures 3 and 4 belng similar views with the invention applied to the well known J aeger mixer. V

Mixing drums of the tilting type may be considered to comprise an upper frustoconical part 5 terminating in the charglng and discharging mouth 6, a central cylindrical part- 7 and a lower closed or dished part 8 which is provided with a curved wall 9 merging into the cylindrical vpart. When in the tilted mixing position the curved wall occupies thelow-est position, the material falling to such part as the drum is rotated. For the purposes of this description this curved part will be considered and referred to as the bottom of the drum;

In carrying out the invention according to the arrangement shown in Figures 1 and 2, the drum is provided with a pair of solid helically arra ngedinternal vanes lO'Which use from the' bottomof'the drum'at 180 apart and extend upwardly a suitable distance, e. g. to about twothirds the height of the drum and each around at least one-third of the circumference of the drum; as shownthe. vanes 10 extend 180. The vanes at their bottom end 11 extend substantially radially and may be: of such, width that the centre ofthe drum isblocked.

, ;Gonjveniently this maybe effected by util-x 4 izing a drum which has an inwardly extending conical, or like. part 12 by which it is mounted on its support for rotationi -By extending the vanes 10 to such conical bearing portion by; "means. of the extension 13, or by blocking themcentre in any other sultablemanner, the iwhole. of the.- material which collects at the bottom will be lifted by each Vane in turn. At their lower ends the vanes may be connected to a common partition extending across the drum.

The vanes 10 may decrease in width gradually as they extend upwardly as shown in Figure 2 and may terminate abruptly or be merged into the casing if desired, or they may be of constant width throughout their length. v

The surfaces of the vanes may be twisted or of varying pitch if desired, or the pitch may be constant.

The inner edges 14 of the vanes-may be curved upwardly for a portion of their length and preferably near their lower ends so A as to prevent spilling of the material until the latter has been raised the desired height."

Adjacent' the upper end of the vanes secondary vanes may be provided which are opposed in direction to or extend across thepath of the helical vanes and against which the material or a part thereof may be thrown to improve the mixing. Such. secondary vanes may comprise two or more slats spaced from one another and from the surface of I the drum, being supported by suitable brackets.

In applying the invention to a mixing" drum of the. Jaeger type (see British Patent'No. 148,076) in which a pair of flats 15 are provided on opposite points of the dished part of the drum, see Figures 3 and 4, the lower ends of the vanes may form a continuation of such flats or be positioned adjacent, thereto whereby the material after being acted upon by such flats is then caught up by the vane and carried upwardly the desired distance.

Figures 3 and i also show an arrangement of secondary vanes comprising spaced slats 16 fixed to the drum by brackets 17. The material caught up by the vanes 10 is adapted to be thrown onto the slats 16.

Although the vanes 10 have been described as: solid they may be partly solid and partly perforated or open, thusthelower parts adjacent the bottom of the drum may be solid while the: upper portions may be formed of slats. vanes may be corrugated or provided with radial ribs to increase the turning over and mixing of the material.

The vanes may bemounted upon the drum in any convenientmanner as by the provision of a suitable number of brackets similar to those indicatedat lZg.

, Although. the invention" has been described in connection with. a mixer having a wall comprising a surface ofrevolution it may be applied to drums which are other than circular in cross-section.

Having. now described: my invention, what Further the upper surfaces of the- I claim as new and desire to secure by Letters Patent is:

1. A mixer of the type adapted to rotate about an inclined axis during the mixing operation, comprising a drumhaving a frustoconioal upper wall part provided with a charging and discharging mouth, and a dished lower part connected to the frustoconical partand forming a closed bottom wall ofthe drum, and vanes connected to the inner wallof. the drum and extending spirally upwardly'from the bottom of the drum, the lower ends of the vanes extending inwardly to the axis of the drum forform ing a partition across the bottom of the drum. n p

2. A'mixer as claimed in claim- 1 wherein the dished lower part is provided with a re-entrant axial hollow portion forming a bearing adapted to receive the shaft in which the drum rotates, the lowerends of thevanes extending inwardly to. such reentrant part. i

3. A mixer as claimed in' claim 1 in which the dished part of the drum. isprovided with fiat portions alternating with parts-conforming to a surface of revolution.

In testimony whereof I have; signed. my 7 name to: this specification,

JOSEPH TEMPERLEY. 

